Anders Behring Breivik has apologised to militant nationalists for only killing 77 people in and around Oslo last year, as a court declared the self-confessed mass-murderer sane and jailed him for 21 years.

The bombing of Norway's government headquarters by Anders Behring Breivik in Oslo last July could have been prevented if existing security protocols had been followed, a government-commissioned report has concluded.

Anders Behring Breivik has called on a Norwegian court to acquit him of the murder of 77 people he has admitted killing as families of his victims walked out during his final remarks at the end of a ten-week trial.

Anders Behring Breivik has claimed the attacks in which he killed 77 people last July fell short of his original plans, in which he intended to decapitate the former Norwegian prime minister, shoot almost 600 people attending a youth camp on an island near Oslo and detonate two further bombs in the country's capital.

Anders Behring Breivik has admitted killing 77 people in Norway in bomb and shooting attacks last July but denied criminal guilt at the Oslo court where he is on trial, claiming the massacre was in 'self-defence'.

A number of Norway stores have pulled violent video games from sale - including several Call of Duty games and World of Warcraft - in the wake of the massacre carried out by Anders Behring Breivik's on July 22.